Relationship between moving speed and morphological parameters of barchan dunes

doi:10.7522/j.issn.1000-694X.2019.00032

Journal of Desert Research ›› 2020, Vol. 40 ›› Issue (1): 29-40.DOI: 10.7522/j.issn.1000-694X.2019.00032

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Relationship between moving speed and morphological parameters of barchan dunes

Li Aimin^1,2,3, Han Zhiwen¹

1. Key Laboratory of Desert and Desertification, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China;
2. College of Urban Construction, Heze University, Heze 274015, Shandong, China;
3. University of Chinese Academy of Sciences, Beijing 100049, China

Received:2019-02-27 Revised:2019-03-23 Online:2020-01-20 Published:2020-01-18

Abstract

Abstract: In the monitoring area of the barchan dune evolution in the hinterland of Taklimakan Desert, we get high temporal resolution three-dimensional coordinate data with a precision of millimeters by using the Huace X90 GNSS receiver. ArcGIS 10.0 and CASS9.0 were used for data analyzing and processing, and the fifteen morphological parameters were extracted, and the moving distance is extracted too. The curve estimation analysis between moving speed and the fifteen morphological parameters was made by SPSS21.0. The results show that there is a significant piecewise linear function relationship between the moving speed and the moving direction with the moving direction 230° as the boundary. When the moving direction is between 210° and 230°, which is consistent with the downwind of prevailing wind NE in survey area, and the moving speed is > 1.5 m/month; when the moving direction is between 230ånd 320°, the moving speed is ≤ 1.5 m/month. There is a negative linear function relationship between the moving speed and the dune height, and the speed will decrease by 2.263 units for every one unit increment of height, and the height has a greater effect on speed. A positive growth function relationship existed between the moving speed and the dune trend, and the positive linear correlation is existed both with left and right wing trend. The research results provide support for defining the specific factors affecting the moving speed of barchan dunes and improving its calculation formulas, and will be helpful for the accurate analysis of small-scale aeolian landform evolution.

Key words: Taklimakan Desert, barchan dune, three-dimensional coordinate measurement, morphological parameters, curve estimation

CLC Number:

P931.3

Li Aimin, Han Zhiwen. Relationship between moving speed and morphological parameters of barchan dunes[J]. Journal of Desert Research, 2020, 40(1): 29-40.

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Relationship between moving speed and morphological parameters of barchan dunes

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